character: Ms. Lee
topic: Heavy Metal Toxicity in Aquatic Systems
grade: 9
subject: Chemistry
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character: Mr. Johnson
topic: Impact of Acid Rain on Water Quality
grade: 9
subject: Chemistry
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character: Dr. Smith
topic: Bioaccumulation of Toxins in Marine Life
grade: 9
subject: Chemistry
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character: Ms. Patel
topic: Effects of Pollution on Freshwater Ecosystems
grade: 9
subject: Chemistry
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